Dual Behavior of Suspended Sediment Concentration in a Regulated River

Abstract

Better understanding of suspended sediment transport processes allows for better management of both rivers and coasts. Based on field data and sediment transport energy theory, this study presents an analysis on the suspended sediment hysteresis in the Lower Tenryu River of Japan in connection to the channel carrying capacity of suspended sediment and morphological characteristics. The transport of suspended sediment in the river exhibited dual behaviors according to the magnitude of flood. It was transport-limited in a 10-year flood while supply-limited in a 30-year flood. In the supply-limited case, the temporal variation of suspended sediment concentrations followed the hydrograph well. In the transport-limited case, however, there was a time lag between peak discharge and maximum suspended sediment concentration. The mechanism of time lag was further clarified to be different for the 10-year flood and a small flood. The objective of this paper is to shed some new light on the relationship of suspended sediment to flow and channel conditions

Spatial relationship between hydrodynamic and physico-chemical parameters of surface water for a basin with shale rock series as an indicator of intensity and direction of chemical denudation in the Western Carpathians

“…The diversified rock bottom relief impacts high water turbulence and,thus, the transport of weathered loads (Priess et al, 2015;Szatten, 2016). Stationary tests with a high measurement frequency are then performed to determine the relationship between flooding and suspension concentration in particular years (Huan, 2011). On the other hand, in the Beskidy catchments, which include the variability of the transported clastic weathered water, quantitative relationships between hydrological parameters and their supply against the background of water erosion have been shown (Brański, 1975;Brański, 1990).…”

Qualitative simulation of bathymetric changes due to reservoir sedimentation: A Japanese case study

“…There are five major dams along the main river, namely, Yasuoka Dam, Hiraoka Dam, Sakuma Dam, Akiba Dam, and Funagira Dam (Fig 1). The largest one is Sakuma Dam [15], which was the 10th biggest dam in Japan at the time of its construction in 1956.…”